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thanks mike, so for my cable size calcs and then my VD calcs what should i use.. my SWA will run through 9 inch brick work and then will be clipped to an outside wall and not run underground. clipped direct? free air?

this is, i hope relevant to the thread. i am putting in a new board as my job for mr napit. the customer wants a hot tub and i do not want to put it on the existing wired fuse board. i could put in a second 1 way rcd board to run the hot tub but the customer is happy for the full upgrade...

thanks TTC.. quick question though.. i could fit an isolator and ask the leccie co to connect it? would that be "best practice"? and look better for me when mr napit comes calling?

definition of "clipped direct"? does this mean clipped to wall outside and not buried, in insulated wall, in ground etc? if so what is "in free air"? many thanks. also the difference between magnetic and non magnetic armoured please? just asking because i am calculating cable...

ok this is my job that Napit will be assesing me on... so the napit dude will know when i show him my lovely new henley and the fresh split tails and asks me a loada questions that i must have either pulled the fuse or wore a VDE rated plastic suit!! .. will i fail his assesment?

is that the only way to do it? wont he leccie co. get the hump. would it put the customer in a situation if leccie co see that fuse has been tampered with?

steve surprised by the quick response.. wots this a long weekend?.. he he .. me to. sun out down here, how bout in yorkshire? thanks. so unless i can talk them into a complete new main board then the tail split in and out of a two way henley is the way forward.. ? quick question though...

kkynaston thanks for that.. bearing in mind the peak board is pretty full "Board 1 - He has 1 x 60amp main fuse feeding 4 x 30amp wired fuses (sockets up and down, cooker and shower) and 2 x 6amp wired fuses (lights up and down) on a board that has 2 slots left." would me splitting...

morning, my next door neighbour has a new hot tub arriving shortly and asked if i could look at his CU and see if i could suggest if everything is in place and what would need doing. (why he is asking me i am not sure) Board 1 - He has 1 x 60amp main fuse feeding 4 x 30amp wired fuses...

arh.. that all be it then.. thanks for the english reply..appreciate that.. this shed power is coming of a 62amp 3 phase board feed from one of the 3 main 60amp fuses at the front of the house.. i just need one live so just treat the shed installation as normal single phase supply..? if...

thanks RF... why is VDrop so bad then ?

excellent many thanks.. so 5% is the minimum allowed limit and anything above that is a no no.. 5% of what though? you may not beleive this but i am taking this all in. thanks..

"18mv x 20A x 50m = 18v" what is 18mv? so in english the full 20amp will carry over the 50m better using 4mm than 2.5mm yeah because its not so squashed.. however over the 50m using 2.5 mm i will only be able to draw about 15amps ish, and increasing swa to 4 mm i will be able to draw a...

ok loosing me a little on the vdrop however i think i get it. to be on the safe side and to cater for some extras in the shed i will go 32amp mcb using 4mm SWA over the 50m.. that ok? and thanks!!!!!! :P

Lectrician yep sorry dude was longer than i thought... will the v drop be a problem?

thanks for getting back so quickly RF. 2.5mm and 50m in length.. assume though if i have both heaters going at once doesnt give me much room to plug anything else in.. spose could get away with a tv of something but not a beefy flymo? hows my thinking so far.. if i wanted more...

I have two metal clad double sockets and FCU that feeds the light in my shed all via SWA from a 20amp mcb on the rcd side of the cu. can i run 2 x 2kw convector heaters 1 plugged into each of the sockets? my guess is that the convectors draw 8.7amps each and my 60watt light next to...

Just getting some power down to a shed.. Just want a double socket and a light in there. Was going to do this. 20amp mcb. 2.5mm 3 core SWA Metal clad socket in the shed.. Assume if i wanted any more than 20amp in the shed then i would need to increase SWA size..? many thanks

you have lost me sorry...PCB?

firstly thanks fopr getting back. am using the existing switch. +ve is the blue and black and -ve is the red and brown yes? with the yellow and green the common yes? if thats the case i get 20v between +ve and -ve and when i touch the green and yellow to either of the other pairs the...